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avcodec/mpegvideo: fix buffer clear code so it should work with negative linesizes 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-02-23 18:14:59 +01:00
parent 5642dd41cc
commit 42361bdf51
1 changed files with 9 additions and 8 deletions
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17
libavcodec/mpegvideo.c
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@ -1774,14 +1774,15 @@ int ff_MPV_frame_start(MpegEncContext *s, AVCodecContext *avctx)
return -1;
}
memset(s->last_picture_ptr->f.data[0], 0x80,
avctx->height * s->last_picture_ptr->f.linesize[0]);
memset(s->last_picture_ptr->f.data[1], 0x80,
(avctx->height >> v_chroma_shift) *
s->last_picture_ptr->f.linesize[1]);
memset(s->last_picture_ptr->f.data[2], 0x80,
(avctx->height >> v_chroma_shift) *
s->last_picture_ptr->f.linesize[2]);
for(i=0; i<avctx->height; i++)
memset(s->last_picture_ptr->f.data[0] + s->last_picture_ptr->f.linesize[0]*i,
0x80, avctx->width);
for(i=0; i<FF_CEIL_RSHIFT(avctx->height, v_chroma_shift); i++) {
memset(s->last_picture_ptr->f.data[1] + s->last_picture_ptr->f.linesize[1]*i,
0x80, FF_CEIL_RSHIFT(avctx->width, h_chroma_shift));
memset(s->last_picture_ptr->f.data[2] + s->last_picture_ptr->f.linesize[2]*i,
0x80, FF_CEIL_RSHIFT(avctx->width, h_chroma_shift));
}
if(s->codec_id == AV_CODEC_ID_FLV1 || s->codec_id == AV_CODEC_ID_H263){
for(i=0; i<avctx->height; i++)